Natural rubber has high mechanical strength and good elasticity, styrene-butadiene rubber has better wear resistance and aging resistance, and butadiene rubber has good wear resistance, cold resistance and elasticity after vulcanization, so it is often used in the production of rubber soles. However, the price of natural rubber is high and volatile, so many sole manufacturers have set their sights on vulcanized rubber powder. Vulcanized rubber powder has low price, elasticity and reinforcement, and can be used in the production of rubber soles to reduce part of the rubber cost and improve the performance of rubber compounds.
1. Rubber soles are mixed with different proportions of vulcanized rubber powder
Formula 1: 40 parts of natural rubber, 60 parts of styrene-butadiene rubber, 40 parts of tread reclaimed rubber, 20 parts of vulcanized rubber powder, 3.2 parts of zinc oxide, 1.5 parts of stearic acid, 1 part of antioxidant D, 30 parts of carbon black N330, 20 parts of aluminum silicate, 20 parts of activated clay, 6 parts of coumaron resin, 3 parts of engine oil, 1 part of accelerator DM, 1.6 parts of accelerator DOTG, 2.5 parts of sulfur; Total: 249.8 shares.
Formula 2: 50 parts of natural rubber, 50 parts of butadiene rubber, 100 parts of reclaimed rubber, 50 parts of vulcanized rubber powder, 5 parts of zinc oxide, 3 parts of stearic acid, 1.5 parts of antioxidant D, 10 parts of pine tar, 3 parts of industrial fat, 4 parts of coumaron resin, 1.5 parts of accelerator DM, 1.5 parts of accelerator M, 0.2 parts of accelerator TMTD, 2.5 parts of sulfur; Total: 282.2 parts.
Formula 3: 70 parts of natural rubber, 30 parts of butadiene rubber, 150 parts of vulcanized rubber powder, 5 parts of zinc oxide, 3 parts of stearic acid, 2 parts of antioxidant A, 45 parts of carbon black N330, 20 parts of clay, 20 parts of light calcium, 3 parts of coumaron resin, 0.6 parts of accelerator D, 1.4 parts of accelerator DM, 0.8 parts of accelerator M, 4 parts of sulfur; Total: 354.8 shares.
2. Rubber soles are mixed with vulcanized rubber powder and the formula is optimized
(1) In formula 1, 40 parts of natural rubber and 60 parts of styrene-butadiene rubber are used as the basis, and 40 parts of tread reclaimed rubber and 20 parts of vulcanized rubber powder are used to make use of the wear resistance of styrene-butadiene rubber and the cost-effectiveness of reclaimed rubber, and at the same time, the strength of the sole can be improved through vulcanized rubber powder. In addition, 3.2 parts zinc oxide and 1.5 parts stearic acid help to improve the processing properties and vulcanization efficiency of rubber.
(2) In formula 2, the ratio of natural rubber and butadiene rubber is adjusted to 1:1, and the amount of reclaimed rubber is increased to 100 parts, and the amount of vulcanized rubber powder is increased to 50 parts; It enhances the elasticity and resistance to deformation of the sole, especially at low temperatures. In addition, appropriately increasing the amount of pine tar and industrial grease can further improve the flexibility and processing performance of rubber.
(3) In formula 3, the dosage of vulcanized rubber powder is increased to 150 parts, and the proportion of natural rubber and butadiene rubber is reduced, which can further reduce costs while maintaining the basic performance of shoe soles. The dosage of carbon black N330 was appropriately increased to improve the wear resistance and aging resistance of the sole.
The use of vulcanized rubber powder can be adapted to different rubber sole production processes, including molding, injection, etc.; The rubber sole mixed with vulcanized rubber powder can improve the abrasion resistance, flex resistance and elasticity of the rubber sole 2SLYY1120, and the dimensional stability of the product is high to a certain extent. In actual production, vulcanized rubber powder can be used as an organic reinforcing agent to improve the abrasion resistance, flexural resistance and elasticity of rubber soles; Proper addition of vulcanized rubber powder can reduce the amount of other reinforcing agents and fillers.
Selecting the right rubber raw materials and designing the rubber sole formula with a reasonable design can not only optimize the performance of the rubber sole, but also flexibly adjust it according to market demand and cost-effectiveness; This formulation optimization is the key to improving the competitiveness of the product; In the future, Xiaobian will continue to share with you more low-cost vulcanization formulas for rubber soles mixed with vulcanized rubber powder.
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